Structural Study of Atmospheric Corrosion of Alloy MgIn

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  • Ohno Hiroki
    The Research Institute for Iron, Steel and Other Metals, Tohoku University
  • Ino Shozo
    The Research Institute for Iron, Steel and Other Metals, Tohoku University
  • Iwasaki Hiroshi
    The Research Institute for Iron, Steel and Other Metals, Tohoku University

Abstract

The process of atmospheric corrosion of the alloy MgIn has been investigated by means of reflection high energy electron diffraction, scanning electron microscopy, electron probe microanalysis and other techniques. The alloy surface in the as-polished state has a metallic luster but is already covered with a thin composite film consisting of magnesium oxide and isolated indium. When exposed to an atmosphere of high humidity, it is corroded forming a number of pits which are filled with corrosion products. Corrosion proceeds continuously until the alloy is changed into black, brittle products consisting of magnesium hydroxide and isolated indium metal. The latter then appears on the surface of the products in the form of whiskers and massive extrusions.

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